Ethernet video explanation in Urdu and Hindi

Youtube

Dailymotion

History

Aloha

If receive Ack then communication success otherwise send again. It was designed for 3Mb/s.

Slotted Aloha

Delay of transmission of collided packet for a random time.

DIX Ethernet in 1980

DIX was developed by three organizations Digital, Intel, and xerox. In 1980 DIX Ethernet v.1 was introduced with the speed of 10Mb/s.

Project 802 of IEEE

In 1985 IEEE started a project 802. Named for the year and month (’80 Feb). Its goal was to set standards to establish communication between devices. It defines a family of protocols at Data link and physical layers. Ethernet10BaseT was introduced. Manchester encoding.

802.1–overview of project 802, including higher layers and internetworking

Ethernet Frame.

Preamble:

7 bytes with pattern 101010……………1010101010 used for clock synchronization. eighth byte is start of frame (10101011)

Addresses:

6 bytes (Source and Destination MAC address).

Type/length:

Indicates the type of the Network layer protocol.mostly IP but may be Novell IPX and AppleTalk. Allow multiple network layer protocols to be supported on a single machine (multiplexing). Identifies the length of data field.

CRC:

It checks errors at receiver, if detected, frame discard.

Data:

It is sequence of bits less than or equal to 1500. carries data from the upper-layer protocols.

Pad:

Zeros are added to the data field to make the minimum data length = 46 bytes.